Legal claims defining the scope of protection, as filed with the USPTO.
1. A method, comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal by reducing and averaging differential quadrature components of the received signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said indication of said wireless telecommunications signal is a Fourier transformed indication (X i , Y i ), and said modifying an indication of said wireless telecommunications signal comprises correcting said Fourier transformed indication with estimates of a differential reference vector (dX r , dY r ).
2. A method according to claim 1 , wherein: said differential reference vector is obtained by calculating differences between said corrected Fourier transformed indications and closest constellation point values to provide differential quadrature components of the corrected received signal dX i and dY i , reducing said differential quadrature components to obtain reduced differential components dX ir and dY ir and averaging sequences of said reduced differential components to provide a current estimate of said differential reference vector.
4. A method according to claim 3 , wherein: said averaging is accomplished according to dX r ( i ) = ( 1 / N ) ∑ dX jr = ( A 0 / N ) * ∑ j = i - N i ( dX j cos Δ j - dY j sin Δ j ) / a j , dY r ( i ) = ( 1 / N ) ∑ dY jr = ( A 0 / N ) * ∑ j = i - N i ( dY j cos Δ j + dX j sin Δ j ) / a j , where dX r (i) and dY r (i) are averaged differential components at the i'th received symbol, and N is the number of symbols being averaged.
5. A method according to claim 4 , wherein: said N symbols being averaged are a block of N symbols.
6. A method according to claim 4 , wherein: said N symbols being averaged are a sliding window of N symbols.
7. A method according to claim 4 , wherein: said N symbols include only symbols deemed reliable.
9. A method according to claim 8 , wherein: said reference signal has coordinates X 0 =1 and Y 0 =0.
10. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal by reducing and averaging quadrature components of the received signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said indication of said wireless telecommunications signal is a Fourier transformed indication (X i , Y i ), and said modifying an indication of said wireless telecommunications signal comprises correcting said Fourier transformed indication with estimates of a reference vector (X r , Y r ).
11. A method according to claim 10 , wherein: said reference vector is obtained by obtaining quadrature components of the corrected received signal X i and Y i , reducing said quadrature components to obtain reduced components X ir and Y ir , and averaging sequences of said reduced components to provide a current estimate of said reference vector.
13. A method according to claim 12 , wherein: said averaging is accomplished according to X r ( i ) = ( 1 / N ) ∑ X jr = ( A 0 / N ) * ∑ j = i - N i ( X j cos Δ j - Y j sin Δ j ) / a j , Y r ( i ) = ( 1 / N ) ∑ Y jr = ( A 0 / N ) * ∑ j = i - N i ( Y j cos Δ j + X j sin Δ j ) / a j , where X r (i) and Y r (i) are averaged components at the i'th received symbol, N is the number of symbols being averaged.
15. A method according to claim 14 , wherein: said reference signal has coordinates X 0 =1 and Y 0 =0.
16. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal by reducing and averaging differential quadrature components of the received signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said indication of said wireless telecommunications signal is a Fourier transformed indication (X i , Y i ), and said modifying constellation point values comprises generating corrected coordinates of the constellation points X cn and Y cn .
17. A method according to claim 16 , wherein: said corrected coordinates are obtained by obtaining differences between said received signal and said corrected coordinates to provide differential quadrature components dX i and dY i , reducing said differential quadrature components to obtained reduced differential components dX ir and dY ir , averaging sequences of said reduced differential components to provide current estimates of a differential reference vector (dX r , dY r ), and using said current estimates of said differential reference vector to obtain corrected coordinates X cn and Y cn , where n=1,2, . . . , m, and where m represents the number of constellation points.
19. A method according to claim 18 , wherein: said averaging is accomplished according to dX r ( i ) = ( 1 / N ) ∑ dX jr = ( A 0 / N ) * ∑ j = i - N i ( dX j cos Δ j - dY j sin Δ j ) / a j , dY r ( i ) = ( 1 / N ) ∑ dY jr = ( A 0 / N ) * ∑ j = i - N i ( dY j cos Δ j + dX j sin Δ j ) / a j , where dX r (i) and dY r (i) are averaged differential components at the i'th received symbol, and N is the number of symbols being averaged.
20. A method according to claim 19 , wherein: said N symbols being averaged are a block of N symbols.
21. A method according to claim 19 , wherein: said N symbols being averaged are a sliding window of N symbols.
22. A method according to claim 19 , wherein: said N symbols include only symbols deemed reliable.
24. A method according to claim 16 , wherein: said corrected coordinates are obtained by reducing said X i , Y i to obtain reduced components X ir and Y ir , averaging sequences of said reduced components to provide current estimates of a reference vector (X r , Y r ), and using said current estimates of said reference vector to obtain corrected coordinates X cn and Y cn , where n=1,2, . . . , m, and where m represents the number of constellation points.
26. A method according to claim 25 , wherein: said averaging is accomplished according to X r ( i ) = ( 1 / N ) ∑ X jr = ( A 0 / N ) * ∑ j = i - N i ( X j cos Δ j - Y j sin Δ j ) / a j , Y r ( i ) = ( 1 / N ) ∑ Y jr = ( A 0 / N ) * ∑ j = i - N i ( Y j cos Δ j + X j sin Δ j ) / a j , where X r (i) and Y r (i) are averaged components at the i'th received symbol, N is the number of symbols being averaged.
27. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal by reducing and averaging differential quadrature components of the received signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said wireless telecommunications signal is a multicarrier signal with correlated phase shifts, said indication of said wireless telecommunications signal is a Fourier transformed multicarrier indication (X k ,Y k ), where k is a carrier index k=1, . . . N where N is the number of carriers in said multicarrier signal, and said modifying an indication of said wireless telecommunications signal comprises correcting said Fourier transformed multicarrier indication with estimates of a differential reference vector (dX r , dY r ).
28. A method according to claim 27 , wherein: said differential reference vector is obtained by calculating differences between said corrected Fourier transformed multicarrier indications and closest constellation point values to provide differential quadrature components of the corrected received signal dX k and dY k , reducing said differential quadrature components to obtain reduced differential components dX kr and dY kr , and averaging sets of said reduced differential components to provide a current estimate of said differential reference vector.
30. A method according to claim 29 , wherein: said averaging is accomplished according to ⅆ X r = ( 1 / K ) ∑ ⅆ X kr = ( A 0 / K ) ∑ k = 1 K ( ⅆ X k cos Δ k - ⅆ Y k sin Δ k ) / a k , ⅆ Y r = ( 1 / K ) ∑ ⅆ Y kr = ( A 0 / K ) ∑ k = 1 K ( ⅆ Y k cos Δ k + ⅆ X k sin Δ k ) / a k , where K is the number of of said multicarrier signal, and where dX r and dY r are averaged differential components.
32. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal by reducing and averaging differential quadrature components of the received signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said wireless telecommunications signal is a multicarrier signal with correlated phase shifts, said indication of said wireless telecommunications signal is a Fourier transformed multicarrier indication (X k , Y k ) where k is a carrier index, k=1, . . . K where K is the number of carriers in said multicarrier signal, and said modifying an indication of said wireless telecommunications signal comprises correcting said Fourier transformed multicarrier indication with estimates of a reference vector (X r , Y r ).
33. A method according to claim 32 , wherein: said reference vector is obtained by reducing a set of components X k and Y k to obtain reduced components X kr and Y kr , and averaging set of said reduced components to provide a current estimate of said reference vector.
35. A method according to claim 34 , wherein: said averaging is accomplished according to X r = ( 1 / K ) ∑ X kr = ( A 0 / K ) ∑ k = 1 K ( X k cos Δ k - Y k sin Δ k ) / a k , Y r = ( 1 / K ) ∑ Y kr = ( A 0 / K ) ∑ k = 1 K ( Y k cos Δ k + X k sin Δ k ) / a k .
37. A telecommunications apparatus, comprising: a receiver which receives a wireless telecommunications data signal without accompanying pilot signals, said receiver including a demapper, said demapper including means for extracting phase adjustment information from the telecommunications data signal by reducing and averaging differential quadrature components of the received signal and for using said phase adjustment information to demap said wireless telecommunications data signal by either modifying a Fourier transformed indication X i , Y i ) of said telecommunications data signal by correcting said Fourier transformed indication with estimates of a differential reference vector (dX r , dY r ) and comparing a so-modified indication to constellation point values to obtain a decision, or by modifying constellation point values and comparing a Fourier transformed indication (X i , Y i ) of said wireless telecommunications data signal to the modified constellation point values to obtain a decision.
38. A telecommunications system, comprising: a first telecommunications apparatus including a transmitter which transmits a wireless telecommunications data signal without accompanying pilot signals; and a second telecommunications apparatus including a receiver which receives said wireless telecommunications data signal, said receiver including a demapper, said demapper including means for extracting phase adjustment information from the telecommunications data signal by reducing and averaging differential quadrature components of the received signal and for using said phase adjustment information to demap said wireless telecommunications data signal by either modifying a Fourier transformed indication (X i , Y i ) of said telecommunications data signal by correcting said Fourier transformed indication with estimates of a differential reference vector (dx r , dY r ) and comparing a so-modified indication to constellation point values to obtain a decision, or by modifying constellation point values and comparing a Fourier transformed indication (X i , Y i ) of said wireless telecommunications data signal to the modified constellation point values to obtain a decision.
39. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal by reducing and averaging differential quadrature components of the received signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein, said wireless telecommunications signal is a multicarrier signal with correlated phase shifts, said indication of said wireless telecommunications signal is a Fourier transformed multicarrier indication (X k , Y k ) where k is a carrier index, k=1, . . . K where K is the number of carriers in said multicarrier signal, and said modifying constellation point values comprises generating corrected coordinates of the constellation points X cn and Y cn .
40. A method according to claim 39 , wherein: said corrected coordinates are obtained by obtaining differences between said received signal and said corrected coordinates to provide differential quadrature components dX k and dY k , reducing said differential quadrature components to obtain reduced differential components dX kr and dY kr , averaging sequences of said reduced differential components to provide current estimates of a differential reference vector (dX r , dY r ), and using said current estimates of said differential reference vector to obtain corrected coordinates X cn and Y cn , where n=1,2, . . . , m, and where m represents the number of constellation points.
42. A method according to claim 41 , wherein: said averaging is accomplished according to dX r = ( 1 / K ) ∑ dX kr = ( A 0 / K ) ∑ j = i - K i ( dX j cos Δ j - dY j sin Δ j ) / a j , dY r = ( 1 / K ) ∑ dY kr = ( A 0 / K ) ∑ j = i - K i ( dY j cos Δ j + dX j sin Δ j ) / a k / j , where dX r and dY r are averaged differential components for all carriers of said multicarrier signal, and K is the number of said carriers.
44. A method according to claim 39 , wherein: said corrected coordinates are obtained by reducing said X k , Y k to obtain reduced components X kr and Y kr , averaging sequences of said reduced components to provide current estimates of a reference vector (X r , Y r ), and using said current estimates of said reference vector to obtain corrected coordinates X cn and Y cn , where n=1,2, . . . , m, and where m represents the number of constellation points.
46. A method according to claim 45 , wherein: said averaging is accomplished according to X r = ( 1 / K ) ∑ X jr = ( A 0 / K ) ∑ j = i - K i ( X j cos Δ j - Y j sin Δ j ) / a j , Y r = ( 1 / K ) ∑ Y jr = ( A 0 / K ) ∑ j = i - K i ( Y j cos Δ j + X j sin Δ j ) / a j , where X r and Y r are averaged components, and K is the number of carriers of said multicarrier signal.
47. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal by reducing and averaging differential quadrature components or quadrature components of the received signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision, or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said wireless telecommunications signal is a multicarrier signal with correlated phase shifts, said indication of said wireless telecommunications signal is a Fourier transformed multicarrier Y-coordinate indication (Y k ), where k is a carrier index k=1, . . . K where K is the number of carriers in said multicarrier signal, and said modifying an indication of said wireless telecommunications signal comprises correcting said Fourier transformed multicarrier Y-coordinate indication with estimates of either a reference Y-coordinate (Y r ) or a differential reference Y-coordinate (dY r ).
48. A method according to claim 47 , wherein: said differential reference Y-coordinate is obtained by calculating differences between said corrected Fourier transformed multicarrier Y-coordinate indications and closest constellation point values to provide differential quadrature components dX k and dY k , reducing said differential quadrature components to obtain reduced differential components dY kr , and averaging said reduced differential components to provide a current estimate of said differential reference Y-coordinate.
50. A method according to claim 49 , wherein: said averaging is accomplished according to dY r = ( 1 / K ) ∑ dY kr = ( A 0 / K ) ∑ k = 1 K ( dY k cos Δ k + dX k sin Δ k ) / a k , where K is the number of carriers of said multicarrier signal, where dY r is said differential reference Y-coordinate, and where A 0 is the amplitude of the reference vector.
51. A method according to claim 47 , wherein: said reference Y-coordinate is obtained by reducing a set of components X k , Y k to obtain reduced components Y kr , and averaging said set of said reduced components to provide a current estimate of said reference Y-coordinate.
53. A method according to claim 52 , wherein: said averaging is accomplished according to Y r = ( 1 / K ) ∑ Y kr = ( A 0 / K ) ∑ k = 1 K ( Y k cos Δ k + X k sin Δ k ) / a k , where A 0 is the amplitude of the reference vector.
54. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said wireless telecommunications signal is a multicarrier signal with correlated phase shifts, received carriers of said multicarrier signal are phase corrected by predetermined values of dY r or Y r radians to obtain a set of corrected carriers, the set of corrected carriers is used for making multicarrier current decisions, differential quadrature components of the corrected carriers are calculated using the current decisions, the set of differential quadrature components or the quadrature components of the carriers are reduced and their Y-components are averaged, and the average values are used as the predetermined values in phase correcting the received carrier values of a next multicarrier signal.
55. A method comprising: a) receiving a wireless telecommunications data signal without accompanying pilot signals; b) extracting phase adjustment information from the wireless telecommunications data signal; and c) using said phase adjustment information, demapping said wireless telecommunications data signal by either modifying an indication of said wireless telecommunications data signal and comparing a modified indication to constellation point values to obtain a decision or by modifying constellation point values and comparing an indication of said wireless telecommunications data signal to the modified constellation point values to obtain a decision, wherein said wireless telecommunications signal is a multicarrier signal, said modifying comprises correcting all received carriers of said multicarrier signal with some predetermined phase shift or with a constant phase increment, and with some predetermined sign to provide a set of corrected carriers to provide said modified indication X k , Y k , said comparing comprises using said set of corrected carriers for making multicarrier current decisions, said multicarrier current decisions being used to determine differential quadrature components of the carriers, dX k , dY k , and said demapping further comprises reducing said set of differential quadrature components or said modified indication, and applying a majority vote algorithm to the reduced set of differential quadrature components or said reduced set of modified indications, and based at least partially on said majority vote algorithm, determining said phase adjustment information.
56. A method according to claim 55 , wherein: said majority vote algorithm transforms said reduced set of differential quadrature components or said reduced set of modified indications into an integer, and said determining said phase adjustment information comprises comparing said integer to a predetermined threshold.
57. A method according to claim 56 , wherein: said determining said phase adjustment information further comprises making no phase correction if said integer relates to said predetermined threshold in a first manner, and determining a direction of phase correction if said integer relates to said predetermined threshold in a second manner.
58. A method according to claim 57 , wherein: said determining said phase adjustment information further comprises, assigning a phase shift value equal to an average phase shift of majority carriers if said integer relates to said predetermined threshold in said second manner.
59. A method according to claim 57 , wherein: said determining said phase adjustment information further comprises, assigning a phase shift value equal to a predetermined constant increment if said integer relates to said predetermined threshold in said second manner.
60. A method according to claim 55 , wherein: said majority vote algorithm comprises D + - = ∑ k = 1 K Sign ( dY k cos Δ k + dX k sin Δ k ) or D + - = ∑ k = 1 K Sign ( Y k cos Δ k + X k sin Δ k ) where K is the number of carriers of said multicarrier signal, Δ k is a phase difference between a decision vector for the k'th carrier and a reference vector.
Unknown
October 23, 2007
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